Salimath, P MBasavaraja, G T2019-08-142019-08-142002No. of references 210http://krishikosh.egranth.ac.in/handle/1/5810121527"An investigation was carried out to elucidate information on induced mutations in three soybean genotypes viz., Ankur, JS-335 and Local black soybean. Two mutagens viz., gamma irradiation (10, 20 and 30 kR) and EMS (0.4, 0.6 and 0.8%) were used. Mi, M2 and M3 generations were evaluated during 1997 to 1999 at MRS farm, University of Agricultural Sciences, Dhanvad. Mutagenic sensitivity in Mi generation on the basis of reduced germination, survival and pollen fertility revealed a dose dependent reaction and differential response of the varieties. LD50 was found to be around 20-30 kR in case of gamma irradiation and 0.4-0.6% in EMS irrespective of the genotype. Studies in M2 generation revealed differential response of the varieties with respect to chlorophyll and viable mutations. EMS was more effective and efficient compared to gamma rays. Induced polygenic variability was assessed in M2 and M3 generations. In general, wide range of variability was created for most of the traits in all the treated populations compared to control. The range in general increased towards positive side in all the varieties with both the mutagens. EMS treatments were effective in increasing the yield potentiality compared to gamma rays in both generations. Correlation between characters in both M2 and M3 generations, got strengthened or weakened or altered compared to control offering better scope for yield improvement through selection. Pods per plant exerted maximum direct as well as indirect effects on seed yield in most of the populations. Intergeneration correlation indicated no advantage of early generation selection for yield. Ten mutants of Ankur confmned their resistance to rust in field as .well as glass house conditions. From the present investigation, 25 mutants were identified as promising for yield and yield cora.ponents (pods per plant, 100 seed weight) and rust resistance. Ankur was more promising in yielding useful mutants compared to JS-335 and Local black soybean."ennullThesis